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Field Test of a Concrete Bridge in Örnsköldsvik, Sweden [Elektronisk resurs] SB-7.3 Sustainable Bridges

Elfgren, Lennart (författare)
Enochsson, Ola (författare)
Puurula, Arto (författare)
Thun, Håkan (författare)
Luleå tekniska universitet Institutionen för samhällsbyggnad och naturresurser (utgivare)
Publicerad: Luleå : SustainableBridges, 2008
Engelska 406
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  • Background - In the project Sustainable Bridges (www.sustainblebridges.net) important objectives are to increase the transport capacity and service life of existing bridges. In order to demonstrate new and refined methods developed in the program, field tests of existing bridges were carried out in Work Package 7. One of the bridges which have been tested is a 50 year old two-span concrete bridge located in Örnsköldsvik in northern Sweden.Due to time, legal and cost restraints, concrete bridges are seldom tested to failure. It was therefore deemed vital to carry out such a test here, as it is the only way to check if applied analytical and numerical models do catch the essential behaviour at failure of a structure.Objective - The Örnsköldsvik reinforced concrete bridge was loaded to failure to test new and refined methods developed in the project regarding procedures for inspection and condition assessment (WP 3), load carrying capacity in combined shear, torsion and bending (WP 4), monitoring (WP5), and strengthening (WP 6).To achieve a shear failure and to avoid an uninteresting bending failure, the bottom slab was strengthened before the final test. Near Surface Mounted Reinforcement (NSMR) was used consisting of Carbon Fibre Reinforced Polymers (CFRP).Results – The Bridge has two spans of 12 m. A loading beam made of steel was placed in the centre of one of the spans. The loading beam was then pulled down with cables injected to the bedrock beneath the bridge.The methods developed in the Sustainable Bridges program showed to be reliable. The inspection and condition assessment indicated that bridge was in good condition with almost no reinforcement corrosion. This was shown to be true. Material tests gave important contributions to steel and concrete properties. The load carrying capacity was underestimated with Swedish and European Codes, BBK04 and EN1992-2. combined with linear elastic finite element calculations. Better results were obtained with non-linear methods as the Modified Compression Field Theory (MCFT) and the non-linear finite element program Atena, recommended by the Guideline SB-LRA (2007) produced in the project. The monitoring methods used for concrete and steel strains, crack initiation, deflections and damage detection worked well. The strengthening method also worked very well. The bridge could carry a load of 11,7MN which was 20 to 50 % more than predictions based on BBK04 and EN 1992-2.The failure test showed that the bridge without strengthening managed to carry not only one train, as it was designed to do, but eight trains on top of each other with an axle load of 250 kN. With strengthening it could carry 11 trains. This shows that concrete railway bridges might have a considerable reserve of extra load-bearing capacity. 

Ämnesord

Engineering and Technology  (hsv)
Civil Engineering  (hsv)
Infrastructure Engineering  (hsv)
Teknik och teknologier  (hsv)
Samhällsbyggnadsteknik  (hsv)
Infrastrukturteknik  (hsv)
Structural Engineering  (ltu)
Konstruktionsteknik  (ltu)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

Civil engineering and architecture - Building engineering
Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik
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